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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1713addfe9edec2e49d6ac9e19b10e3064a4ac7e84884b06bdf5dcf86ff18c79' 
  AND token = 'w2Wt1ETdZsWg1I8lzsHQvvUVXR7HmE5cCwc01kggboE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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