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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd29950480e90b16d18adffaeba08faef24e32b0a546d04c1498db4eea9b7e08' 
  AND token = 'sh46nIR6O94H0B8NxWAReW1X+e9slZrhqJkzmobuFwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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