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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c284ddabdeac1b78fdf466ca4b60f5c792e3598ab5730da41bb93f5fb1f05bb7' 
  AND token = '5rsTcDMYgof2vsmU7ucFYt6WkCB1uQUJmo73aJx+xPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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