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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07945fb823dc31e44f7c1c9270c7f50365766e601c173e2a4e50fd3c4786ab0d' 
  AND token = 'HSOKBqXOFUZCEWDEjfdEwpvugwpS9F91Md3sZQtYT8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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