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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe2046e7c542384ba10cda811a728d655020a7690c02678e2591700d72f5d25' 
  AND token = 'h8cRVm2/L1lrgGPuoMKi5/2xSIkh6KvbniSSgT1T/tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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