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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298ed7059ec83257c729881ef545b8438e9e8e21cb9f4e2f6ef163cc203139a9' 
  AND token = 'B9fw6EBUTLnRbUtSVdWELj0ef+U7PWAi6j9a6rN0QFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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