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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338f2ef77e26da54e58b750863f90109d97a0ae5f57602731708dd021e7b12f8' 
  AND token = 'OWJGmF9347SBMic1WdH000a/NQCSIW2N2/7TqvvVgtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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