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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbe7d5b0a841862489a17cb1d2c98fe1ea24db29a7d5488dcece65e867acfad' 
  AND token = 'bx3O8U2Ee2/2IBbGwhH61HRvBmhH4Yp2/K8tDUTxQek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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