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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97af19f043542bbd787e855dc791b2ee9b0edfa93abc98b0dee8fef01a34a1e0' 
  AND token = '+pmGljhpC2eI7h/czqoSv49iHxvKmSHaPJA4jEt18+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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