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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e9ab6ec001a6f5bd73a2c409eb82710152a05faab79fb26fc76fb8aeacbb9f' 
  AND token = '4JuctF98/AJzcvl8s7QT48K3ojeE6DFPFX/dQdu1QNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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