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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc88574180be0db5a11e41d68ecd9d6e0801c77a80ed8bfe30efff3ef22d0655' 
  AND token = 'y2lllJPi6kCx8eZzUVU2gjgcYAzlz2p1ha81vYTpPwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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