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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f162e06d0a77138496aa8f8582247eb38f85992e2c0cca991256cc815ec2847e' 
  AND token = 'LyZ79kqmseIXGJLU9ZGg6uU1CLdnM1iS3xkv/ev7ows=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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