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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa11777a3b97a2a2341004fb3862ec4f356cc5c2171b556557f7e092be8f392' 
  AND token = 'zjcg3in+XPFNyqZR744zuYb6ZCCd90Pe2HAcEOYwNiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}