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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0324a13d07afeb3bb2f2a187a24fbd5aa084d456fb95eeaa6834158e57278cd' 
  AND token = 'FnmRE/smM+A2O1Opo8lierOlG4fcq4KXofK1sEHvQ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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