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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df75ccf4f559a6440fa3025e8e065052fa132a7381f46aacd422da779d2e74ef' 
  AND token = 'KQtaiOsfTBSDgOu5WxQjA5aFi6fWrGxe8n9GV3gGy1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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