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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89166c1b64fd8d905271d1b9d68922d365541d0a1b0ce27a08099dcd20cdaa2b' 
  AND token = 'l4c80GcZGrVX2Jn33JC/rEjb38VLdjBjsJiuk6Jvhcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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