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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0097c1c19637ddc68c3a2b10fa359d61ef12735f5064cefc8849b53d0c2aed30' 
  AND token = 'P0ORM0iaFMYLURxK2LEjo7g6UJz2aZ447iqPaKEQ14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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