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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6d903ddd6cb488a338a72fbc938decc66d0ee35ab61f0725cd10a548c6b992' 
  AND token = '5HVN0LDyChN7bA0Z0bcy2n9TuMuMYFZRfGjqL9b29mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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