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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ea7f6305fa2128692d5a8e8567262d69382d2d3b11bc687ee658a6bffb1769' 
  AND token = '3u8bBKyggr1jBNs9wv11WYTAZS0My0nyWWf7YCIHRV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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