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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9541243c90d0a484db391be310e481d999f4782fec96a5342b7040b66a1c34d1' 
  AND token = '/iBrJFO7dOP5Z2lfHKtXTFqEx+27A5PDsh5hvSQyREM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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