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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5095ab79353990b4f342eafb2852e63295b41a3c66acf683d576c8c7b416c2e7' 
  AND token = 'fUnhWjPTbtQM7bQM0MLtCZ934g6oFnn3ZfLagzWXWus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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