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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afd4ef59959d986cfc65d822c4366b63a0a7fc2a3803ba1d83a0668fe4113cb' 
  AND token = 'c2d1/hwTbJqobhOSksl2/4RvL6XAz90676/okidB8PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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