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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7992d4ac8f8b0373d92d3187598c910844082b0d6720e8ab598130e9bb946e1' 
  AND token = 'bS6QWt4rZwkMYcVx6Uu0zq3VaeDulGJ+xtJgUnNa5DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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