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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a447692a63ed49ed8c02505307fc1c10b6e2ad57ddef89fcfeeb89e3382e20e0' 
  AND token = 'G06mIxT0ASrwAGxxvEmN/mjm5/0B++OR/8+kWBa2COw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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