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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628773d8a3ca61e2131f4ad3bed0e8ed72bea3f735db87a385ca1a00506fe90b' 
  AND token = 'Dp+r54qMWowR+DYY5bAFBFPi9qgP3hgd06MkAl8JL6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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