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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2ce1201aaed2b97c4c388f2f97659ba8f553e48a0d70b816dd9c01229cce10' 
  AND token = '1hUsKuEwxBiaaliXle1J9vZyKVkeRdAEWMblxTR74OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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