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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e742077e94d2f3fb581958274469e9e34057d83bdb4b1f12eb95df427e3bcb7' 
  AND token = 'tJiGi+2fSeZvL65M3AKeasH3dHHAcx+Gu0d/RSfwaVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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