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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685dd19cef137452f6e215331b971132b71f02e25281a25f2df4cca8ca6fa8b7' 
  AND token = 'KHv1tSdRlEeXf4/u0zQ/UhCwM/X5J/Z6zk22k7CgW5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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