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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c15eb7e8a54c58b82036a6d5d197a01a8df8b2f9031575f89b553cef78477a' 
  AND token = 'UpW+n8R3foa6vq/b7k5vKhbhTPF138HKkkkcUsAmzfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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