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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59378ecdb5a8ce9e7fa933f3b8eb0d636369c7d63d949cd246441b4add1cdfa1' 
  AND token = '6zEur5+XkHgksEpdboWobQU8NAA/y6cPNnJLf3WvWdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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