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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4ea1bece0584d28c58be8de8ce4e0fd2fe437b2151b312ee58c7f97ed8ee7e' 
  AND token = '6yEoOGVyv5evZ8H8uLZKBjbMs0WSZWGcA6hCHOAGtv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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