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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa06b08f1f8389773372fa5a73b8a1547a5c6baca25e0b7654025447a1f1e1c' 
  AND token = 'ZWCBruptKC3V7eqFWsdiaMKP07h65CulvllDYXMIqiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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