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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b52ce9a42db3fddbd53eabad9fe217c280b4acc8d8dd63cb210f1128640fd9d' 
  AND token = '2TCTU2mVAnU7Pe6KiocB1uUgZ8TyP8aW1WHRKg/3CNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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