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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b26d14496ada47b095ff91399d1ce68a97d3c996d27387633f30a497c24eb5' 
  AND token = 'Yplgk7foiE1ba25ydfU+OKA8T9djrTFba8h9SFV8DBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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