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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fed941e494527c8cef846190d7fa6f76377e78c616cc0eeed4aea9a4b5d2e5' 
  AND token = 'DQ2AknBm/1oxP0kmp8bM4UoaQweBbJc94UCnOBbRBfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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