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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdea581f51b8cc279c3a1cb084461c3d580cbf8cd2abdb970b444df103f309c' 
  AND token = 'hBqWuNq+zfx2IdUkvyMFNkMp9236Ts775aH+uRWR1+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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