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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d92f54772d26bbfa5bcd30c040db4ef48e4f81bcde04ab852e6a128fed8894' 
  AND token = 'df0DmcpDxn+ub27sgbe0DREgvKypDNKSSfyr2cvU+nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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