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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '445050816a3bdf873aa9fe53ff035f4556d7c9595c010575984e216cebdab70b' 
  AND token = 'eUFNTC8kwkY5MEUNrkFRn6T0E96L7UEZZbX3CmJZMjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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