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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be7a6bf496773d20cd9a49f923065cc0cd705d7715d3b4d60a6a355bb70f39b' 
  AND token = 'i8INUrWJ6/XMB9TTBvNatsKrTs3W9sxkVMnMrhI9VqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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