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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d89f4dd0c2e19df5e2addba6661ed663fb83ba3779fcd423582a7013f684ff9' 
  AND token = 'U0EwhN1sgbOJg3XrUIHA4X33Mq937mXQqUmuglZ2M6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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