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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6f24f2b865ce41e1fb597b7ca4525bfcf74ec75231f7e6786f5a4bfae310b6' 
  AND token = 'JkxmF0XI9tslI6GuNtsE5YexgsLJkU6wTwX4f88eFXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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