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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75eb07947974870d3cdd1f0ca569a32777e2ae0f868ab2bd595f3c2482f05a3a' 
  AND token = 'Vesqo3uVReX5QinD8HzgXPNJBatrDbKAOXvxtS6CCds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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