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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6771ac4226b7ae529d2c0a5688a825bfe5000334436837b3b46a9393fc1b6a30' 
  AND token = '8h0yT9RNP96x6kNKDNNBD/cULlacInLa09LAibRfTV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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