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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb43feb0a2b30432eab3de2210245f2af4c7b00d254d9a50ab7650cfc8e34c8d' 
  AND token = 'FHXATa1Ni+/v09AkrjIg7NVRJ8iSZG+lOTOsx9u0mXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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