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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d210c4bd1a97ed09c9aa15267a60195496a01e0a8a2ef7c7a85122b5e07a978' 
  AND token = 'PVnHOZdsVk332nSk0u5Au2XB4AMSokCVGHNEVGjNcR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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