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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c3da2442cbde27c48a4d33c5dd3f5eef670f9849aed4a09c4eaa4bcfdf119e' 
  AND token = 'ghT3+fDw7BHIOg2XfCpF0/2vwx5JmuzuNau4y200Wrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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