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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fdd9c18bb6b39c3f5ec992367871941629b0341f1f3c32ed830fd4b2b10a5a' 
  AND token = 'wlyc1d8mFaKITMgkbvhj4K6f+DZlNHv23atYtZk8YnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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