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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5668f3f01c35de5609adc7abb5e8855765969b98186e5ef1b6ca2acc66dc4e5' 
  AND token = '9WMBNLhIxRGE2W+TpayyQ+4tCaADXfn7CU/6P2gVUYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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