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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6908f5f9db02a8c1d8e981c32ea398b1a0b6213133fd1165d0292d918900c387' 
  AND token = '9lBVRAFbDT84xoalOs67J8pQYgECyj3xUi2zuu6fmwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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