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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117c46280b608531562ee99bd0ed4f3cb3dee9af0543033a8f6bc951ba857ac2' 
  AND token = 'G+8zDZ95+8dxajlqCE6RlmUpRTCFEdahRyw4Sjts5Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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