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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8e14498386a03d21fbd9ba7cb7389f4f4ef06a8ad4e779bd5ad165b7a7725c' 
  AND token = 'KkRjksHkPwJNEld8pda7vmO/LM/23Tx3xFOFOnZrPWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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