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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7b609b7524639985675eaa997bbbdb63c4af4c5317c3d93d5d233d12ea44c8' 
  AND token = 'RY6R+7pODtliMilAnRDqrqU2IaKjb+1gOWw31/r24xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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