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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904a2522ec30ea87686ec60046d859532acbf2ae5e1246e47d0e770f79f9b635' 
  AND token = 'hVN63+nqV60g9Aj6E1QXLS3+cS4hLFNR5ynqnhUvilI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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