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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830f6cf9a08adb41ff203074fff130505debf9c7adc474c5bbc9481274fa1e5a' 
  AND token = 'thckiUzNkV2oupeDo1KEvbJTgg6TEEhsEKK7wZeAfuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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