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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a398682cd8f0aead9f8f5573823abe3a3277f70ae259ae55164c1c525771e3e' 
  AND token = 'pSYWeOn0MJuHG3JxjIWLy5UDhucJKSf7ypo5dS4xvDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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