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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ba50965b4e808e13654bbab9b5fabd77e35a0aca4d94673850504b67abe4c6' 
  AND token = '0IrJPow/eoU+PHvmARJy5J9yzZQTPZpvdSnvMOb6eqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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