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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191f1812c318dfc52757681bdcf40e5483b29f22aa2eee41d6fcf6cee21e1082' 
  AND token = 'CAuBhyrsnSM2HjyKffnUdawyAVk8GHbZTICFf19QNMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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