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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218c319b858c33c5ce7616988d056210621c95c58f3a78631633329f879ed0ea' 
  AND token = 'pcA2kW6mEXsZHfIjCmrWdUCEHF7s68WPL4RazDsNZ7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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