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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6cdea2eaf22826e87b41c7e7187ddc09b152e77d422231c4f0e9ffed8e0a9d' 
  AND token = 'SlB9wz8sM8mlEiSzWMdAZ4MhcrWhADNryQDDDtTyW2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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