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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912e92781f81703e2fd90141f568db3cceca5206f03f5b3db1995c301ff9048e' 
  AND token = '3yTtdMlc9J0I600xRjg2R8VCRtqrp1l0npasar6JTmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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