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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d2f3f0f62acb8ebbaedb083a8e10f6d8be67c0b01c06c1bdc07181ec490685' 
  AND token = '9Le+6X5theMjGDvf7YN8O4zaPeYlKAyNo+BYtcfEXDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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