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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101d315bf0343d6ae94628d2100553ef19d5466a5959a9476742c4126fd90e4b' 
  AND token = 'KYFexpkoLCMbWSIJD79ixAX30WoupeHPQ19yUbC7btE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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