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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9f82bc2a3824214ecb276a4d3cb1fc11aac1ad46766ae907a7190fe73c73ce' 
  AND token = 'z9s5nhVeib3VSL6F3ilAknQNJ76sXb6di/1ACNIyFpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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