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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b8f1bfcd713edc55837a2e997ae725615bf554ef2785c7b79cc1db93586aca' 
  AND token = 'tkpFPX85FxTbJgz0Bk9VNacXpJMXsKgO//aiMnTyO5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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